The partner of a pregnant mother killed after an allegedly stolen car crashed into her says the family are experiencing "conflicting emotions" following the miracle birth of their baby boy in the aftermath of the crash.

Doctors managed to deliver the baby boy, who was just 32 weeks old, alive following the horrific crash that claimed the life of 24-year-old Sarah Paino.

In a statement released today, Ms Paino's partner Daniel Stirling confirmed that the baby boy - named Caleb - was in a stable condition.

"On behalf of Sarah, myself and our family, I want to thank the community for their overwhelming generosity and support," reads the statement.

Sarah Paino's two-year-old son was also in the car, however he escaped with only minor injuries.

"This is a time of conflicting emotions for us as we grieve the loss of Sarah, whilst also welcoming baby Caleb to our family."

Tiana Barron, a friend of Ms Paino, said earlier that the mother had been looking forward to finally seeing her baby in her ultrasound scan, which was reportedly scheduled for today.

“We talked every day and she told me last week how excited she was about seeing her baby in the final scan,” Ms Barron told the Herald Sun.

“She already knew she was having a boy, but this scan was going to be the last one before his birth so she was really looking forward to seeing him on the screen and seeing how much he’d developed,” she said.

Ms Paino was killed when she was returning home from dropping her partner, Daniel Stirling, off at the bakery where he worked.

Her two-year-old son was in the backseat, however he survived the crash with only minor injuries.

The 15-year-old boy who police allege was driving the vehicle that crashed into Ms Paino has been charged with manslaughter.